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1 // -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1996 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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21 |
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22 */ |
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23 |
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24 #if defined (__GNUG__) |
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25 #pragma implementation |
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26 #endif |
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27 |
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28 #ifdef HAVE_CONFIG_H |
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29 #include <config.h> |
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30 #endif |
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31 |
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32 #include <iostream.h> |
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33 |
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34 #include "dbleSCHUR.h" |
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35 #include "f77-fcn.h" |
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36 #include "lo-error.h" |
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37 #include "mx-inlines.cc" |
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38 |
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39 extern "C" |
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40 { |
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41 int F77_FCN (dgeesx, DGEESX) (const char*, const char*, |
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42 SCHUR::select_function, const char*, |
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43 const int&, double*, const int&, |
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44 int&, double*, double*, double*, |
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45 const int&, double&, double&, double*, |
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46 const int&, int*, const int&, int*, |
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47 int&, long, long); |
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48 } |
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49 |
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50 static int |
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51 select_ana (const double& a, const double&) |
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52 { |
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53 return (a < 0.0); |
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54 } |
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55 |
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56 static int |
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57 select_dig (const double& a, const double& b) |
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58 { |
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59 return (hypot (a, b) < 1.0); |
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60 } |
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61 |
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62 int |
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63 SCHUR::init (const Matrix& a, const string& ord) |
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64 { |
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65 int a_nr = a.rows (); |
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66 int a_nc = a.cols (); |
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67 |
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68 if (a_nr != a_nc) |
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69 { |
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70 (*current_liboctave_error_handler) ("SCHUR requires square matrix"); |
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71 return -1; |
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72 } |
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73 |
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74 char *jobvs = "V"; |
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75 char *sense = "N"; |
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76 char *sort = "N"; |
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77 |
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78 char ord_char = ord.empty () ? 'U' : ord[0]; |
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79 |
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80 if (ord_char == 'A' || ord_char == 'D' || ord_char == 'a' || ord_char == 'd') |
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81 sort = "S"; |
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82 |
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83 select_function selector = 0; |
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84 if (ord_char == 'A' || ord_char == 'a') |
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85 selector = select_ana; |
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86 else if (ord_char == 'D' || ord_char == 'd') |
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87 selector = select_dig; |
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88 |
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89 int n = a_nc; |
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90 int lwork = 8 * n; |
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91 int liwork = 1; |
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92 int info; |
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93 int sdim; |
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94 double rconde; |
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95 double rcondv; |
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96 |
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97 schur_mat = a; |
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98 unitary_mat.resize (n, n); |
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99 |
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100 double *s = schur_mat.fortran_vec (); |
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101 double *q = unitary_mat.fortran_vec (); |
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102 |
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103 Array<double> wr (n); |
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104 double *pwr = wr.fortran_vec (); |
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105 |
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106 Array<double> wi (n); |
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107 double *pwi = wi.fortran_vec (); |
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108 |
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109 Array<double> work (lwork); |
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110 double *pwork = work.fortran_vec (); |
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111 |
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112 // These are not referenced for the non-ordered Schur routine. |
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113 |
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114 Array<int> bwork; |
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115 Array<int> iwork; |
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116 |
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117 if (ord_char == 'A' || ord_char == 'D' || ord_char == 'a' || ord_char == 'd') |
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118 { |
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119 bwork.resize (n); |
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120 iwork.resize (liwork); |
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121 } |
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122 |
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123 int *pbwork = bwork.fortran_vec (); |
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124 int *piwork = iwork.fortran_vec (); |
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125 |
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126 |
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127 F77_XFCN (dgeesx, DGEESX, (jobvs, sort, selector, sense, n, s, |
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128 n, sdim, pwr, pwi, q, n, rconde, rcondv, |
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129 pwork, lwork, piwork, liwork, pbwork, |
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130 info, 1L, 1L)); |
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131 |
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132 if (f77_exception_encountered) |
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133 (*current_liboctave_error_handler) ("unrecoverable error in dgeesx"); |
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134 |
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135 return info; |
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136 } |
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137 |
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138 ostream& |
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139 operator << (ostream& os, const SCHUR& a) |
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140 { |
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141 os << a.schur_matrix () << "\n"; |
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142 os << a.unitary_matrix () << "\n"; |
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143 |
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144 return os; |
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145 } |
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146 |
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147 /* |
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148 ;;; Local Variables: *** |
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149 ;;; mode: C++ *** |
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150 ;;; page-delimiter: "^/\\*" *** |
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151 ;;; End: *** |
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152 */ |
